很实用的数据类型转换

/*
	 * 001.json转换成对象
	 * 
	 * @param:传入对象，json字符串
	 * 
	 * @return:Object
	 */
	public static Object jsonToObj(Object obj, String jsonStr)
			throws JsonParseException, JsonMappingException, IOException {
//		System.out.println(obj.toString());
//		System.out.println(jsonStr);
		ObjectMapper mapper = new ObjectMapper();
		//mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);  
 		return obj = mapper.readValue(jsonStr, obj.getClass());
		
	}

	/*
	 * 002.对象转换成json
	 * 
	 * @param:传入对象
	 * 
	 * @return:json字符串
	 */
	public static String objToJson(Object obj) throws JsonProcessingException {
		ObjectMapper mapper = new ObjectMapper();
		return mapper.writeValueAsString(obj);
	}
    public static Map<String, Object> jsonToMap(String jsonString) throws JsonParseException, JsonMappingException, IOException {
    	ObjectMapper MAPPER = new ObjectMapper();
//    	JavaType jvt = MAPPER.getTypeFactory().constructParametricType(HashMap.class,String.class,String.class);
    	HashMap<String,Object> mmap = MAPPER.readValue(jsonString, HashMap.class);
//        Map<String,String> urMap = MAPPER.readValue(jsonString, jvt);
         return mmap;
    }